I wonder if there was one added step on every post to this network "warning, you are about to make this public without the possibility of removal, are you sure

I wonder if there was one added step on every post to this network "warning, you are about to make this public without the possibility of removal, are you sure you want to post this?", would that better educate people and make them less likely to make public that which they will later wish was private? I think the solution is also a culture or user education issue. Basically teach people more about how the Internet works and they're less likely to want to post information on it.